Originally Posted by
Doc Kwok
Correct, she murdered both Consorts Donggo and Xiaokang (Kangxi's mother), plus Consort Donggo's son, Prince Rong.
Prince Rong was the fourth prince, Xuanye (Kangxi) was the third.
Kangxi was conflicted when Mao Dongzhu was captured and brought before him by WXB. On the one hand, she had inflicted horrific damage to his family, which led to his father leaving and orphaning him. On the other hand, she was also the one person he could ever confide in apart from WXB, plus he believed that if Prince Rong had lived, he would never have had a chance at the throne given how much his father loved Consort Dongge.